2778949500 has 192 divisors, whose sum is σ = 8573160960. Its totient is φ = 697536000.

The previous prime is 2778949487. The next prime is 2778949513. The reversal of 2778949500 is 59498772.

It is an interprime number because it is at equal distance from previous prime (2778949487) and next prime (2778949513).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 8008327 + ... + 8008673.

It is an arithmetic number, because the mean of its divisors is an integer number (44651880).

Almost surely, 2^2778949500 is an apocalyptic number.

2778949500 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2778949500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4286580480).

2778949500 is an abundant number, since it is smaller than the sum of its proper divisors (5794211460).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2778949500 is a wasteful number, since it uses less digits than its factorization.

2778949500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669 (or 657 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 51.

The square root of 2778949500 is about 52715.7424305112. The cubic root of 2778949500 is about 1405.9187348107.

The spelling of 2778949500 in words is "two billion, seven hundred seventy-eight million, nine hundred forty-nine thousand, five hundred".